A Multiple Watermarking Algorithm for Digital Image Based on Chaotic Sequences
Zhen Ji · Chinese Journal of Computers · 2003
A multiple watermarking algorithm for digital image based on chaotic sequences is proposed. The massive and independent digital watermark signals are generated through 1-D chaotic maps, which are determined by different initial conditions and parameters. The construction of massive digital watermarks is effectively resolved through this chaotic digital watermark signals. Multiple watermarking algorithm is more complex than the single watermarking algorithm in the embedding method. Each watermark is added to the middle frequency coefficients of wavelet domain randomly by exploiting 2-D chaotic system, so that the embedding and extracting of each watermark don't disturb with each other. The watermarks can be protected to be removed malevolently if the parameters of 2-D chaotic system are considered as the key to embedding procedure. Therefore the performance of security is improved. The capacity of the multiple watermarks is also analyzed in this paper. The experimental results demonstrate that this proposed watermarking algorithm is robust against many common attacks and can resolve the problems of multi-copyright claim and the tracing of digital image products in the different phase of publishing, selling and using.